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Scientifically speaking, there are only two places dust are made:

1. Outside.
2. Inside.

Don’t worry, NPR gets into the specifics when they ask people who have devoted their whole professional lives to the study of dust. According to the article there are all types of dust: fluffy and dense dust, organic and inorganic dust, large and small dust. Then there’s the scariest dust of all: toxic dust—the reason scientists are devoting so much time to studying it.

How do we become exposed to it and what do we do about it? Check out the full article.

Lots more interesting facts in science.